Ch.14 - Mendelian GeneticsWorksheetSee all chapters
All Chapters
Ch.1 - Introduction to Biology
Ch.2 - Chemistry
Ch.3 - Water
Ch.4 - Carbon
Ch.5 - Biological Molecules
Ch.6 - Cells
Ch.7 - The Membrane
Ch.8 - Energy and Metabolism
Ch.9 - Respiration
Ch.10 - Photosynthesis
Ch.11 - Cell Signaling
Ch.12 - Cell Division
Ch.13 - Meiosis
Ch.14 - Mendelian Genetics
Ch.15 - Chromosomal Theory of Inheritance
Ch.16 - DNA Synthesis
Ch.17 - Gene Expression
Ch.18 - Regulation of Expression
Ch.19 - Viruses
Ch.20 - Biotechnology
Ch.21 - Genomics
Ch.22 - Development
Ch.23 - Evolution by Natural Selection
Ch.24 - Evolution of Populations
Ch.25 - Speciation
Ch.26 - History of Life on Earth
Ch.27 - Phylogeny
Ch.28 - Prokaryotes
Ch.29 - Protists
Ch.30 - Plants
Ch.31 - Fungi
Ch.32 - Overview of Animals
Ch.33 - Invertebrates
Ch.34 - Vertebrates
Ch.35 - Plant Anatomy
Ch.36 - Vascular Plant Transport
Ch.37 - Soil
Ch.38 - Plant Reproduction
Ch.39 - Plant Sensation and Response
Ch.40 - Animal Form and Function
Ch.41 - Digestive System
Ch.42 - Circulatory System
Ch.43 - Immune System
Ch.44 - Osmoregulation and Excretion
Ch.45 - Endocrine System
Ch.46 - Animal Reproduction
Ch.47 - Nervous System
Ch.48 - Sensory Systems
Ch.49 - Muscle Systems
Ch.50 - Ecology
Ch.51 - Animal Behavior
Ch.52 - Population Ecology
Ch.53 - Community Ecology
Ch.54 - Ecosystems
Ch.55 - Conservation Biology

Solution: Joshua, age 18, is color blind. His mother and father have normal vision, but his mother's father (Joshua's maternal grandfather) is color blind. All Joshua's other grandparents have normal color vision. Joshua has three sisters - Nikki (age 20), Shaneekwa (age 15), and Laticia (age 27), all with normal color vision. Joshua's oldest sister, Latecia, is married to a man with normal color vision; they have two children: a 9-year old color blind boy and a 4-year old girl with normal color vision.Using correct symbol, annotation, and rules for pedigree construction, draw a pedigree of Joshua's family.

Problem

Joshua, age 18, is color blind. His mother and father have normal vision, but his mother's father (Joshua's maternal grandfather) is color blind. All Joshua's other grandparents have normal color vision. Joshua has three sisters - Nikki (age 20), Shaneekwa (age 15), and Laticia (age 27), all with normal color vision. Joshua's oldest sister, Latecia, is married to a man with normal color vision; they have two children: a 9-year old color blind boy and a 4-year old girl with normal color vision.

Using correct symbol, annotation, and rules for pedigree construction, draw a pedigree of Joshua's family.

Solution

Remember that in a pedigree, the male has square image while a female is round. Those affected with the trait in question are shaded, and the offspring should be placed according to their birth order, with the first-born placed on the left. It should also be noted that each generation occupies one row. The pedigree for the given problem is shown below.

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